Add YT link

Author: andrei-punko

src/main/java/by/andd3dfx/collections/RandomizedSet.java

@@ -36,6 +36,8 @@
  *   randomizedSet.insert(2); // 2 was already in the set, so return false.
  *   randomizedSet.getRandom(); // Since 2 is the only number in the set, getRandom() will always return 2.
  * </pre>
+ *
+ * @see <a href="https://youtu.be/NZeo-yyaUAc">Video solution</a>
  */
 public class RandomizedSet {